hmm_range_fault related fixes and legacy API removal v2

[Jason Gunthorpe]

On Mon, Jul 22, 2019 at 11:44:20AM +0200, Christoph Hellwig wrote:
> Hi Jérôme, Ben and Jason,
> 
> below is a series against the hmm tree which fixes up the mmap_sem
> locking in nouveau and while at it also removes leftover legacy HMM APIs
> only used by nouveau.
> 
> The first 4 patches are a bug fix for nouveau, which I suspect should
> go into this merge window even if the code is marked as staging, just
> to avoid people copying the breakage.

Ignoring the STAGING issue I've tried to use the same guideline as for
-stable for -rc .. 

So this is a real problem, we definitely hit the locking bugs if we
retry/etc under stress, so I would be OK to send it to Linus for
early-rc.

However, it doesn't look like the 1st patch is fixing a current bug
though, the only callers uses blocking = true, so just the middle
three are -rc?

Thanks,
Jason